That was eons ago, but I think I took one or more screen shots of a mapping program or site (MapQuest?), loaded them into an image editing program, then traced over the state boundaries and major highways.

Attached is a version where I loaded the old image into MSPaint and did some crappy editiing to reflect the new Region 5 boundary.

I would assume any decent HTML editor would let you edit it by drawing the areas on the screen. Lacking such a tool, I would (and just did):

Open the image in MSPaint.
Scale the image to match the height and width in the image tag (548x349).
Draw the new boundaries, while paying close attention to the coordinates displayed in the status bar at the bottom of the MSPaint window and noting where I clicked at the end of each line and also looking at the existing values for the old boundary between regions 6 and 8 that will become the new boundary between regions 5 and 8.DO NOT save the image. We're only editing it to find the coordinates of the boundaries.